I always update my apps. If an app gets shitty, I change the app cause the problem is not on the app, it's on the owners philosophy and this is what I wanna get rid of.
I don't use most of Google apps and stock's bloatware , so I don't update it too
For other apps , it depends on the update itself , if it brings good new things and bug fixes I update , otherwise I mostly ignore until the next update